The high humidity shouldn't be too much of an issue, but if you'd like to reduce it, try putting a low wattage heat bulb on the tank. It will lower your humidity. I would shoot for 60%.
What are you using as your substrate? You could possibly change substrates in order to help lower the humidity.
You should feed once every 7 days. Every 3 weeks is not enough. Offer food to your snake a week after the day you brought him home.
Pictures please!
PS: your english is fine![]()